a an-562 application note one technology way ?p.o. box 9106 ?norwood, ma 02062-9106 ?781/329-4700 ?world wide web site: http://www.analog.com filter specification for the internal filters of the adv7190/adv7191/adv7192/adv7194 video encoders introduction this application note documents the filter specifications and detailed plots of the internal filters of the adv7190/ adv7191, adv7192 and adv7194 video encoders. all the above-mentioned devices provide two luma low- pass filters, two luma notch filters, an extended ssaf (super sub alias filter) luma low-pass filter, a luma cif and a luma qcif filter, five chroma low-pass filters, a chroma cif and a chroma qcif filter. the ssaf filter, as can be seen in figure 5, provides a sharp stopband attenuation that enables studio quality video playback on modern tvs, giving optimal horizon- tal line resolution. additionally, it is possible to change the response of the ssaf filter in the passband in using the programmable gain/attenuation feature or sharpness control as can be rev. 0 seen in figures 6, 7 and 8. overall, there are six pro gram- mable gain responses (figure 7) and six programmable attenuation responses (figure 8) in the range of ? db to +4 db available. these responses can be programmed over the i 2 c interface. the tables on the following pages show the filter specifi- cations for all the filters in 2 oversampling and 4 oversampling mode. figures 1?7 highlight the frequency responses in the passband and stopband. figures 18?1 highlight the different frequency responses in 2 oversampling and 4 oversampling. tables i, ii, iii, and iv apply to the adv7190/adv7191, adv7192 and adv7194 video encoders. ssaf is a trademark of analog devices, inc. i 2 c is a registered trademark of philips corporation. table i. luminance internal filter specifications (2 oversampling) passband 3 db stopband stopband ripple 1 bandwidth 2 cutoff 3 attenuation 4 filter type filter selection (db) (mhz) (mhz) (db) mr04 mr03 mr02 low-pass (ntsc) 0 0 0 0.09 4.158 6.05 ?5.7 low-pass (pal) 0 0 1 0.15 4.74 6.41 ?1.1 notch (ntsc) 0 1 0 0.09 2.25/5.0/6.54 8.03 ?8 notch (pal) 0 1 1 0.095 3.07/5.8/6.24 8.02 ?0.5 extended (ssaf) 1 0 0 0.017 6.37 8.03 ?7.4 cif 1 0 1 0.012 3.0 5.09 ?9.2 qcif 1 1 0 0.118 1.5 3.74 ?8.4 notes 1 passband ripple refers to the maximum fluctuations from the 0 db response in the passband, measured in db. the passband is defi ned to have 0 (hz) to fc (hz) frequency limits for a low-pass filter, 0 (hz) to f1 (hz) and f2 (hz) to infinity for a notch filter, where fc, f1, f2 are the ? db points. 2 3 db bandwidth refers to the ? db cutoff frequency. 3 stopband cutoff refers to the frequency (mhz) at attenuation point (db) referred to under note 4. 4 stopband attenuation refers to the attenuation (db) at the frequency (mhz) referred to under note 3.
? an-562 rev. 0 table ii. chrominance internal filter specifications (2 oversampling) passband 3 db stopband stopband ripple 1 bandwidth 2 cutoff 3 attenuation 4 filter type filter selection (db) (mhz) (mhz) (db) mr07 mr06 mr05 1.3 mhz low-pass 0 0 0 0.087 1.397 2.46 ?4 0.65 mhz low-pass 0 0 1 monotonic 0.653 2.41 ?8.3 1.0 mhz low-pass 0 1 0 monotonic 1.0 1.89 ?6.6 2.0 mhz low-pass 0 1 1 0.0438 2.21 3.1 ?5 3.0 mhz low-pass 1 0 0 monotonic 3.18 5.33 ?4.9 cif 1 0 1 monotonic 0.653 2.41 ?8.3 qcif 1 1 0 monotonic 0.5 1.75 ?3.17 table iii. luminance internal filter specifications (4 oversampling) passband 3 db stopband stopband ripple 1 bandwidth 2 cutoff 3 attenuation 4 filter type filter selection (db) (mhz) (mhz) (db) mr04 mr03 mr02 low-pass (ntsc) 0 0 0 0.16 4.24 6.05 ?5.2 low-pass (pal) 0 0 1 0.1 4.81 6.41 ?4.6 notch (ntsc) 0 1 0 0.09 2.27/4.9/6.6 8.03 ?7.3 notch (pal) 0 1 1 0.1 3.1/5.6/6.4 8.02 ?9.7 extended (ssaf) 1 0 0 0.043 6.45 8.03 ?6.6 cif 1 0 1 0.127 3.02 5.09 ?2.6 qcif 1 1 0 monotonic 1.5 3.74 ?8.2 table iv. chrominance internal filter specifications (4 oversampling) passband 3 db stopband stopband ripple 1 bandwidth 2 cutoff 3 attenuation 4 filter type filter selection (db) (mhz) (mhz) (db) mr07 mr06 mr05 1.3 mhz low-pass 0 0 0 0.09 1.395 2.46 ?3.9 0.65 mhz low-pass 0 0 1 monotonic 0.65 2.41 ?1.1 1.0 mhz low-pass 0 1 0 monotonic 1.0 1.89 ?4.43 2.0 mhz low-pass 0 1 1 0.048 2.2 3.1 ?5.9 3.0 mhz low-pass 1 0 0 monotonic 3.2 5.3 ?4.5 cif 1 0 1 monotonic 0.65 2.41 ?1.1 qcif 1 1 0 monotonic 0.5 1.75 ?3.1 notes 1 passband ripple refers to the maximum fluctuations from the 0 db response in the passband, measured in db. the passband is defi ned to have 0 (hz) to fc (hz) frequency limits for a low-pass filter, 0 (hz) to f1 (hz) and f2 (hz) to infinity for a notch filter, where fc, f1, f2 are the ? db points. 2 3 db bandwidth refers to the ? db cutoff frequency. 3 stopband cutoff refers to the frequency (mhz) at attenuation point (db) referred to under note 4. 4 stopband attenuation refers to the attenuation (db) at the frequency (mhz) referred to under note 3.
? an-562 rev. 0 frequency mhz 0 70 0 7 1 magnitude db 23456 10 30 40 50 60 20 0 figure 1. luma ntsc low-pass filter (4 oversampling) frequency mhz 70 0 7 1 magnitude db 23456 10 30 40 50 60 20 0 0 figure 2. luma pal low-pass filter (4 oversampling) frequency mhz 70 0 7 1 magnitude db 23456 10 30 40 50 60 20 0 0 8 figure 3. luma ntsc notch filter (4x oversampling) frequency mhz 70 0 7 1 magnitude db 23456 10 30 40 50 60 20 0 0 8 figure 4. luma pal notch filter (4x oversampling) frequency mhz 70 0 7 1 magnitude db 23456 10 30 40 50 60 20 0 0 8 figure 5. extended (ssaf) luma filter (4x oversampling) frequency mhz 0 10 0 7 1 magnitude db 23456 2 2 4 6 8 0 4 12 figure 6. extended (ssaf) luma filter (4x oversampling) with programmable attenuation/gain in the passband
4 an-562 rev. 0 frequency mhz 0 7 1 magnitude db 23456 4 2 1 0 3 5 1 figure 7. extended (ssaf) luma filter (4x oversampling) zoom in on programmable gain in the passband frequency mhz 0 7 1 magnitude db 23456 0 2 3 4 1 1 5 figure 8. extended (ssaf) luma filter (4x oversampling) zoom in on programmable attenuation in the passband frequency mhz 0 70 0 1 magnitude db 23456 10 30 40 50 60 20 0 figure 9. luma cif filter (4x oversampling) frequency mhz 0 70 0 0.5 magnitude db 1.0 1.5 2.0 2.5 3.0 10 30 40 50 60 20 0 3.5 4.0 figure 10. luma qcif filter (4x oversampling) frequency mhz 0 70 0 0.2 magnitude db 0.4 0.6 0.8 1.0 1.2 10 30 40 50 60 20 0 1.4 1.6 1.8 2.0 figure 11. chroma 0.65 mhz low-pass filter frequency mhz 0 70 0 0.2 magnitude db 0.4 0.6 0.8 1.0 1.2 10 30 40 50 60 20 0 1.4 1.6 1.8 2.0 figure 12. chroma 1.0 mhz low-pass filter (4x oversampling)
5 an-562 rev. 0 frequency mhz 0 70 0 0.5 magnitude db 1.0 1.5 2.0 2.5 3.0 10 30 40 50 60 20 0 figure 13. chroma 1.3 mhz low-pass filter (4x oversampling) frequency mhz 0 70 0 0.5 magnitude db 1.0 1.5 2.0 2.5 3.0 10 30 40 50 60 20 0 3.5 4.0 figure 14. chroma 2.0 mhz low pass filter (4x oversampling) frequency mhz 0 70 0 1 magnitude db 23456 10 30 40 50 60 20 0 figure 15. chroma 3.0 mhz filter (4x oversampling) frequency mhz 0 70 0 0.2 magnitude db 0.4 0.6 0.8 1.0 1.2 10 30 40 50 60 20 0 1.4 1.6 1.8 2.0 figure 16. chroma cif filter (4x oversampling) frequency mhz 0 70 0 0.5 magnitude db 1.0 1.5 2.0 2.5 3.0 10 30 40 50 60 20 0 3.5 4.0 4.5 5.0 figure 17. chroma qcif chroma filter (4x oversampling) 0 0 frequency mhz 0 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling magnitude db magnitude db figure 18. luma ntsc low-pass filter
6 an-562 rev. 0 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 19. luma pal low-pass filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 20. luma ntsc notch filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 51015 2025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 21. luma pal notch filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 22. extended (ssaf) luma filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 23. luma cif filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 24. luma qcif filter
7 an-562 rev. 0 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 25. chroma 0.65 mhz filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 26. chroma 1.0 mhz filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 27. chroma 1.3 mhz filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 28. chroma 2.0 mhz filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 29. chroma 3.0 mhz filter 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 30. chroma cif filter
8 an-562 rev. 0 printed in u.s.a. e3816 0.5 4/00 (rev. 0) 0 0 frequency mhz 0 magnitude db magnitude db 510152025 510152025 20 40 60 80 0 20 40 60 80 2 oversampling 4 oversampling figure 31. chroma qcif filter
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